Commun. Korean Math. Soc. 1998; 13(2): 273-280
Printed June 1, 1998
Copyright © The Korean Mathematical Society.
Dong Seo Kim, Chang Ho Byun
Chonnam National University, Chonnam National University
2023; 38(4): 1019-1028
1999; 14(4): 747-759
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